PATIENT CHARACTERISTICS: Age: 18 to 75 Performance status: ECOG 0-2 Life expectancy: More than 12 months Hematopoietic: Absolute neutrophil count greater than 1,500/mm3 Platelet count greater than 100,000/mm3 Hepatic: Alkaline phosphatase less than 5 times normal Bilirubin less than 1.5 times normal Renal: Creatinine less than 1.5 times normal No uncontrolled or persistent hypercalcemia Cardiovascular: No severe cardiac failure Pulmonary: No severe respiratory failure Other: No other malignant tumor considered incurable or untreatable No uncontrolled pain No psychological, familial, social, or geographical reasons that would preclude study